Method of producing iron girders and very large t-section iron



May 14, 1940. 2,201,071

METHOD OF PRODUCING IRON GIRilERS AND VERY LARGE T-SECTION IRON J.BAUGNEE Filed Aug. 11, 1957 Patented May 14, 1940 wa STATES" PATENTOFFICE METHOD or PRODUCING moN GIRDERS AND VERY LARGE T-SECTION momApplication August 11, 1937, Serial No. 158,615 In Luxemburg August 18,1936 7 Claims.

a height at present limited to 1 metre and the flanged sides of whichare parallel and sharpedged, whereby any connections which require 15 tobe made are considerably facilitated.

For this purpose there have been employed trains of rolls based on theGrey system with reversible roll mechanisms on the lines of thefour-roll universal train. The finishing rolls con- 20 sist of twostands in which the girders are rolled in consecfitive passes.

The development of girder constructions in the past few years, however,has necessitated the manufacture of girders having an extremely 25 largecross-section and a considerably greater height of the web. Sincerolling mills have not been able to produce the cross-sections inquestion the practice has been adopted of welding together three ironplates which in this way form 30' the flanges and the web (Fig. 1).

The primary drawback in this method to which attention has repeatedlybeen drawn consists in the fact that the welding seams, takenwithrespect to the neutral axis, are located at the points 35 where theconnection of the web to the flanges calls for absolute reliability asregards the quality and even nature of the metal.

There will be recognised the advantage of' rolling extremely highT-section iron in the manner 40 which permits of production of thegirders in accordance with Fig. 2, i. e., in such a fashion that thewelding seams of a certain height of girder are approached more towardsthe neutral axis and accordingly into a more advantageous position. Itis also important that .the ends a of this T-section iron are furnishedduring the rolling with bevelled edges which accommodate the weldingseams.

50 It is to be emphasised that these extremely large T-iron girderscanbe employed as primary elementsin iron constructionaor also as upper orlower element in the case of compound girders, or the like. In practiceconstructers are at pres- 55 cut making use of the welding art bywelding together two large flat iron sections as in Fig. 3.

' This, however, is an expensive process.

Actually the rolling mills supply to constructers T-iron of smallercross-section, which is employed in iron structures for auxiliaryelements. 5 This T-iron also possesses sloped sides to the flanges,which make the connection, the riveting together and finally the useunnecessarily diiiicult.

It is the object of the present invention to produce extremely largeT-iron having parallel and sharp-edged flanges by the gradual rolling inand separation of Grey wide-flange girders at the points of constrictiona. (Fig. 2) during the hot rolling. This may take place in one or morepasses without deforming the limbs of the T-iron, in such fashion thatthe web of the half-girder thus produced terminates in a simple orcompound bevelled'edge, i. e., in the form of a simple or double wedge.

Two of these T-iron members can then .be combined by means of thebevelled edge on the web by welding to a wide flat section to form an.extremely high girder as in Fig. ,2, whereby the welding edges aredisposed as near as possible to the neutral axis. They may also beemployed as primary elements in heavy iron structures.

The drawing illustrates the invention and shows in Figs. 1-3, alreadyreferred to above, ar-

rangements-for producing compound girders or beams by welding together aplurality of elements. The girders of Figs. 1 and 2 being I-beams andthe girders of Fig. 3 'l"-beams.

Figs. 4-10 illustrate the use of a train of rolls according to the Greysystem, adapted to produce wide-flanged I-girders having parallel andsharp-edged flanges for the manufacture of T-beams by dividing the webof an I-beam.

Fig. 4;is a diagrammatic side view of a portion of a rolling mill forI-beams supplemented by web indenting, dividing and guiding means.

Figs. 5 and 6 show on a larger scale in crosssection the I-beam acted onby the indenting means. g

Fig. 5a is a modification of Fig. 5. Fig. 7 shows in cross-section theI-beam to be acted on guided by a roller.

Figs. 7w and "lb show in plan and side view respectively the guidingmeans for the I-beam.

Fig. 8 is a cross-section through a portion of the web of the I-beamafter indenting.

Figs. 9 and 9a illustrate the lengthwise cu of the web of the I.-beamalong the central indentation or groove. .55

Fig. 9b shows a modification oi the cutting or shearing means.

Fig. 10 is a diagrammatic cross-section between two I-beam roll standson the line aa of Fig. 4, showing the beams divided by shearing rolls ordiscs with its flanges guided by cooperating guiding elements.

In the drawing A and B (Fig. 4) are two stands of the finishing train,which 1011 the large wideflanged girders in successive passes.

l. C represents a pair of rolls, which. during the rolling of the girderin successive passes on the reversible train roll a gradually increasingr groove or indentation into the web of the girder.

The driven rolls can be moved apart (as in full lines) or approachedtoward each other (as in broken lines) as desired by means of a settingand lifting mechanism. The grooving or indentation occurs duringthe oddseries of passes (direction of the arrow f). The rollers are thereuponmoved apart for the even series of passes (direction of the arrow f1)but are again moved together for the gradual rolling in during theopposite and successive passes.

Figs. and 6 show the positions of the rollers C and the rolling in upontwo consecutive odd passes f. The rolling in is so regulated in thefinal pass that after the passage between the rollers C the half-girdersare merely connected by a thin strip of metal.

2. It is to be emphasised that the gradual rolling in always occursatexactly the same point in the following passes, i. e., in the axis ofthe bar, and the girder must accordingly always be accurately adjustedto the axis of the rolls. This is accomplished by the centering roll 1'(Fig. 4), which is adjustable horizontally and vertically, exactlycorresponding to the inner form of the girder. In front of this rollthere is provided a conical guide q for reliable and ready introductionof the girder between the rolls (Figs.

7, 7a and 7b).

3. After each rolling in by the rollers C the rolled in bar passesthrough the stand A (Fig. 4) which rolls the sectional form and alsomore particularly removes the deformations e produced during the rollingby the rolls C.

4. After emerging from the stand A the bar exhibits an accuratelyimproved sectional form and is introduced between the two freely runningshearing rolls D. These rolls are spaced apart during the consecutivepasses, but are moved f together for the final pass (in the direction ofa very thin strip of metal and the cutting edges form a sumciently largefree angle a with the sectional form to be cut.

Fig. shows a section a-a (according to Fig. 4) through the guides E1 andE2. p is the-rolled irder, E3 and E4 are the lateral guides.

5. The two half-girders finally traverse the 'stand B .(Fig. 4) and thenthe vertical hot Thisready' straightening process. Owing to the innerstresses of the girder the two half-girders exhibit the tendency to moveapart and assume an arouate form and by. cold straightening '0! theextremely large cross-sectional form very consider- 5 able and dangerousstresses would be produced in the T-iron.

It .is to be remarked that the rolling mill. referred to in the aboveproduces two extremely large T-iron members simultaneously, and in thisway permits of high production with extreme economy.

In this way two T-iron members are obtained possessing the desiredcharacteristics: A

:1. Extremely large T-iron members havin parallel and sharp-edgedflanges in similar fashion to the large Grey wide-flange girders, fromwhich they are derived.

1). Sectional form without deformation, as after each rolling in betweenthe rolls C the bar again traverses the stand A, and the cutting by therolls D subsequently taking place is effected under desired conditionswithout deforming the sectional form.

c. Heat-straightened bar.

at. The extreme end of the sectional form of the cut web exhibits acompound or simple bevelled edge with desired slope governed by the formof the rolls C and the knife, and is adapted by reason of these edges toaccommodate the welding seams in the welded iron construction.

It is to be remarked that 1. In order to obtain the simple bevelled edgethe form of the rolls C and D is in accordance with Figs. 5a and 9b.This simple bevelled edge is also sometimes required by constructors forthe welded iron construction.

2. The rolling in might also take place alone during the final pass ofthe bar. In this case there would be employed in place of one pair ofrolls C a plurality of series disposed pmrs, cor- Letters Patent is:-

1. In a method of producing wide-flange I-beams having a considerableheight of the web, the steps which consist of shaping blocks of materialin a hot. rolling process into wide-flange I-beams. indenting the saidweb longitudinally (lining the rolling operation, passing the beambetween shearing rolls to separate the beam longitudinally intohalf-beams having straight beveled edges to their webs. moving the said'half-beams into contact by means of the said beveled edges withstraight beveled edges of a flat iron section, and thereupon welding thebeveled edges of the said webs to the beveled edges of the said fiatiron section to produce an I-beam having a height which is greater thanthe combined heights of the webs of the said halt-girders.

2. In a method of producing T-beams by longitudinally dividingwide-flanged I-beams the steps which consist of subjecting the web of anI-beam under hot rolling action to longitudinal pressure indentation,rolling the indented web in such a manner as to remove deformationresultingfrom the indenting thereof and the 7 web of the I-beam betweenshearing discs for the purpose of separation along the line ofindentation.

8. In a method of producing T-beams by 1ongitudinally dividingwide-flanged I-beams the steps which consist of subjecting the web of anI-beam under hot rolling action to longitudinal pressure indentation,rolling the indented web in such a manner as to remove deformationresulting from the indenting thereof and passing the web of the beam onthe way from one roller stand for hot rolling the I-beam to anotherbetween shearing discs for the purpose of separation along the line ofindentation.

5. In a method of producing T-beams by'longitudinally dividing the webunder hot rolling 1 action the steps consisting of longitudinallyindenting the web of the I-beam by means of one or more pairs oipressure rolls, so as to form a groove, the bottom of which consists ofa thin metal strip, subjecting the web deformed by indentation rollingto regularizing rolling action in such a manner as to remove deformationresulting from the indenting thereof, cutting, through the thin metalstrip by a pair of. shearing discs arranged between I-beam flangeguides, and subjecting the two halves of the I-beam web to hotstraightening action by repeated rolling.

6. In a method of producing T-beams by ion-- gitudinally dividingwide-flanged I-beams the steps which consist of subjecting the web of anI-bam underhot rolling action to repeated longitudinal pressureindentation, 1 rolling the web after each indenting operation in such amanner as to remove deformation resulting from the indenting thereof,and passing the web between shearing disks for the purpose of separationalong I the line of indentation. I-heam under hot rolling action tolongitudinal 7. Ina method of producing T-beams by Iongitudinallydividing wide-flanged I-beams the steps which consist of subjecting theweb of an I-beam under hot rolling action to repeated longitudinalpressure indentation, rolling the web after each indenting operation insuch a manner as to remove deformation resulting from the indentingthereof, and passing the web between shearing disks for the pm ofseparation along the line of indentation, rolling the separated sectionsof the I-beam and subjecting the separated sections to hot straighteningaction.

- .ms'rm momma.

